<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>商城</title>
    <style>
        #d1{width: 900px;height: 600px;border: 1px red dashed;
            margin: 0 auto;}
         #top{
            width: 900px;
            height: 120px;
            background-color: aqua;
            text-align: center;
         }   
         #center{
            width: 900px;
            height: 480px;
            border: 1px blue dashed;
         }
         #left{
            width: 200px;
            height:480px;
            float: left;
            background-color: aquamarine;
         }
         #right{
            width: 698px;
            height: 480px;
            float: left;
            background-color: bisque;
         }
         #r1{
            width: 698px;
            height: 200px;
            background-color: blueviolet;
         }
         #r2{
            width: 698px;
            height: 200px;
            background-color: cadetblue;
         }
    </style>
</head>
<body>
    <div id="d1">
        <div id="top">welcome</div>
        <div id="center">
            <div id="left"></div>
            <div id="right">
                <div id="r1"></div>
                <div id="r2"></div>
            </div>
        </div>
    </div>
</body>
</html>